Śatapatha Brāhmaṇa ("of a hundred paths") 11.5.5.13

11.5.5.13

catvāro hyatra yuktā bhavanti dvau hotārau dvāvadhvaryū pavernu śakveva hanūni kalpayannahnorantau vyatiṣajanta dhīrāḥ na dānavā yajñiyaṃ tantumeṣāṃ vijānīmo vitatam mohayanti naḥ pūrvasyāhnaḥ pariṣiṃṣanti karma taduttareṇābhivitanvate'hnā durvijñānaṃ kāvyaṃ devatānāṃ somāḥ somairvyatiṣaktāḥ plavante samānāntsadamukṣanti hayānkāṣṭhabhṛto yathā pūrṇānparisrutaḥ kumbhānjanamejayasādana ityasurarakṣasānyapeyuḥ

In this (sacrificial session) there are, indeed, four harnessed (steeds),--to wit, two Hotris and two Adhvaryus.--'Like unto the artificer contriving spikes to the spear, the sages coupled the ends of two days: now the Dânavas, we know, will not disorder the sacrificial thread of them stretched out by us.--They leave undone the work of the previous day, and carry it through on the following day,--difficult to be understood. is the wisdom of the deities: streams of Soma flow, interlinked with streams of Soma!--Even as they constantly sprinkle the equal prize-winning steeds, so (they pour out) the cups full of fiery liquor in the palace of Ganamegaya.' Then the Asura-Rakshas went away.